Asking a Custom GPT created in chatGPT possible?

I want to ask if anybody managed using Custom GPTs with activepieces.

ChatGPT is telling me it might be possible with a custom http request as in example below. I see activepieces offers a custom API call.

Not sure though if it really works. It should save a lot if tokens for prompts that require sharing of background information to the GPT.

Did anybody get something like that to work?

Use the HTTP Request node in n8n with the following settings:
• Method: POST
• URL: https://api.openai.com/v1/chat/completions
• Headers:
{
“Authorization”: “Bearer YOUR_API_KEY”,
“Content-Type”: “application/json”
}

Body:

{
“model”: “g-mycustomgpt12345”,
“messages”: [
{
“role”: “user”,
“content”: “Your dynamic prompt from earlier node”
}
]
}

If you use the F dynamic value to provide the model value in the Ask ChatGPT action, does it work? Or Ask Assistant action?

Great idea. But it’s a dropdown for me. Can’t add custom model string there.
Tried with a custom API call, but received error message that the model does not exist or I don’t have access to it. So maybe it is still not possible to access one’s custom GPT’s?